Year	Number of
1990	420.43
1991	431.7
1992	445.15
1993	476.94
1994	513.28
1995	537.8
1996	547.76
1997	553.8
1998	603.48
1999	612.01
2000	624.33
2001	645.74
2002	666.54
2003	706.14
2004	741.03
2005	767.8
2006	796.28
2007	813.91
2008	834.78
2009	851.75
2010	866.52
2011	884.85
2012	909.26
2013	938.56
2014	968.09
2015	1001.88
2016	1031.92